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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3572fd53e6fcc01bd793402680c449d041f7ee9281513602bcae34e72bc37a83' 
  AND token = '/T/R3C0ulkYITBnJ9Hy5jrusi5HBc9hSoUPIW4QrKbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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