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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a4ab2cad8189e11ffbe8ac2a3471b8dcc21595fd8c4e6d254e81e1269c6d25' 
  AND token = 'DulR9ZySZRlUWDCkIS7dSzSim8kuxx0J0V/wtioP2Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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