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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8875cd2c7cdc5189b089572c84489042661a05db6855a1e3d5ba154ce9d2b69' 
  AND token = 'UMsTkMuqa4sCSUrDS7qUwKXinnPHzg8+MwMtWKtq62o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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