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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbecd731fd4bb9933e99e46a396af72e92a772a5762adb1bae45662c3afb39f' 
  AND token = '//jBxWhIEf6dquYOuaxmLoJXMherkcgCQkjtuD6tW7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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