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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c17b35db290cc718b1982b1039a76127f5dbf36332237e45fc990abb371eaf' 
  AND token = 'sApV+o2cRzm3yvQKS1usKsWdHlujYX9H2OYqMXY+qd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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