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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985e46e269d598f9b23c1a0c68287f190f689e00ebcac38bfde2fe9e45769430' 
  AND token = 'C/0aAhdSGMcaWlWY/salp3CzhP1eHd0gAl+EspNRdew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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