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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b3a9ea43cbee8af0fc69e796f1ac6be36eb7a004ebde4bef04dfcc5a120493' 
  AND token = 'Bh5khnM88+zC4zSmomtccOhpSfrgjtk+YSaM6Tn4kc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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