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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3841c44d914e4c54a1ee8803150f32f9d0f1bb0b8efe2efdbd9790e2f9da0e1b' 
  AND token = 'lrcwDnnCqJA9Kkv0D0m1WRgNenkqUbSSDuPdxqORA+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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