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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d89bc044d8281f343848032f59be765df2d7ceff23c8bccf2e47819fb61f396' 
  AND token = 'nNIRpuKz5tB0QCuxOmcPy//jGbOkk/ZoCpvUmPM47c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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