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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f9e59a1ff4ab25b11a84595f41f0f3b5b0fe967bfdb8a4853473b87c6ff557' 
  AND token = 'xrxu9E9jAxnnF64aqMnJg9yPBDMzSOr34dFz5HyVgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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