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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60edfad041cf6e8a3a39773bac4da553960a8ff0da3f99f1f7d0388d7c6c8de3' 
  AND token = 'Y+ENp4rwtB3Mdt+Go8N+UBcoPiy/3twYhu/c+bdonbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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