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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa31b1867b7d9aabd9a0e78c865da04cc4c9d47840bcb26670db0ccd068f3cb1' 
  AND token = 'oRO/bilt0sE6b0DzG8/cf45UPRv0s5+4WHda7zrQa4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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