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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ec276b76dad90ee6e76687fd706e04d9b48d7fbe3b3e18d903f7e9ef2b4c37' 
  AND token = 'p9WVD75YKI/rCjmSrgbrRe/ywXcakQX83gyFw01BbKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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