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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf9317033b5254fab156417bd35a713eb40b770c98f1f6dba88d9e6a57b4da6' 
  AND token = 'mUudO+NipyY+kW7F0ruqFfCWLBcxSCHta+e+dCpFLOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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