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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fafb8dca3cb0d7a6453d7347b979c693134240298ee8d6d6595e226b18defc6' 
  AND token = '/GaQKdgow93XD6wE+euySots/hMKFoVO72Gg2QasWjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}