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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764fec5ee58281c0a58933efb534a43e2cd9d8524a14f77b703b58b0e701b588' 
  AND token = 'PpGRHePaNKqsm2PsWfZXatS3fguBdCu4hlRKCJuHS/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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