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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5ceec8c3f57c8aa256bcecb70baa23ef6e6c77d944798f267da9a4ebb1032f' 
  AND token = 'MMsP48dPvRpw4vsSMWeF/oXazw553m9n6QOLd1fHNLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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