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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e35ade5bf718c06b7c6c4bbd1d7f9f04e5717cdb3fa584d51e57eaed9e64eb8' 
  AND token = 'Cx/3WPZWqJ0VnJyLPlQ6N3FpCYfm0NblHCqoVCSrENo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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