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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b6bb917f4a5c184eafb76079851ec2e23b9f6be2c0c6fae624b42ca8f416fc' 
  AND token = 'MC4IUFlymT6V+HGrwnBQfC0n+4x0lG9hbK4QrcdnLEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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