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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21da9a88a383f1c14f2bac8b0abab435f77208ced73dcc6377774f95a4b5b2e' 
  AND token = 'B9coDKScOWBcBJVCB9ws1jMH+ycRiCKm6n0IaSx5FI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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