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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9ba5e9178be9a5ed8f9100df09aa3511801a3b51a0feecd3faaf4b89c2db1f' 
  AND token = '5ASiJ3LTnfboqdw7Ya9CWfgcBu4zbdcPsTDDCDTt3yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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