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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9d5d131798bbb99e73e9c87d3f7c0e725773f1751d9bb4eadc1fd53d3f8bff' 
  AND token = 'iWSPf+OKjoBUlsbCpgI11gYR3STraIRrqJBKZHnO+GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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