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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d3dea397b53ce87e30008ade1d2d06f0c6c0d888fd8b67dd74bed73846c2fd' 
  AND token = 'LSlms3T22uiKKz+3PWhZF34hJYy5nCxvbSfsAEbeuSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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