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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3cca948d70f3e3d5fb17b762f28b1ccd832f064d38d4d8dac2c5f79ab79fc65' 
  AND token = 'oLXlJdmB5CcJtxa2AJd59En/vC0cGmclGISP3heZnpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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