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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92f8334dca0ab4e6b51a9e698f3efc9f248d685d9a58aaa58571cd5e5433f49' 
  AND token = 'f6DKoPxEpF38HnW5bhLdLq/YzwMQ7bTj1D65ys4a4Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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