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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702a04c9f659f2d895a23a303aba46972bdbd13066435af1c32303d845807e64' 
  AND token = 'mFdfNXl/664JhdMs5FupKepV55+miojGnMDujZAZNVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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