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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2393297247bc1016a7e12b052e1c718e2981a59409829210283c6230c07db671' 
  AND token = 'iWzqbyxTpC89DTAn4AVWRDPUjaZ3Fy1CcshMQ0xvN0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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