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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1b4832c3d22005515be861ef1ab697e0b0c978a0234db90ffb0366b57fe2db' 
  AND token = 'aPQjaJmT8R/wvuI90aDghztiqSrqArrDtY2aWIrioNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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