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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6801d95520d7ab2ce4e88438b5c7c40304ee17f3b88e4da4bc15d23b79a9752' 
  AND token = 'Wgm4kDwChGi4KOFY5KFOquaG64xr9YoW3T2GYbJzwf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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