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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7e98c5c4465270cca787de5706b665ca849731f013557ff8e3e3c11fc77054' 
  AND token = 'sw56LmiB6TzhQVSFL6MtnJ5qm2d57GoI8j9e3MUpM1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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