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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec5cd69d0e3c6e39f21b99dbbff836b8e4d554f99c8c970dd259af62fe44cae' 
  AND token = 'JFf1N0QgVE6/b+HohdY+5n4n59uzIw+1q8IMbzms8FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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