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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087817fc3edae83cba54b939d0159e26655744670f643718c988aad0ef5b65cc' 
  AND token = 'jR65GII3KEAQtE4xSeSw/Aj5mnWw0wffxfg/BQ1A8X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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