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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6155ed3877d9ded577423fb9c869d9efd9f22d4dff510da7a4a58452fea29e' 
  AND token = 'e2LlcrfIHgrAEELo3Huu8H1scJwldcNx/JW0kXRJWVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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