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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c46669a6bfc7fd14d51a4534f457875d447e751e6b17915e16a41432edbc937' 
  AND token = 'Hgjnhap79ZFSmAobvrxXsPKXaGUKekFn7qJKHm8dpdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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