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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b88e40f55656f1e84bc33d6de065da018c660e82268a6fbd9408080024bc53' 
  AND token = '1IyX4Zmv1D1OEb8O15kmHiQQNd3a8y4AgA4Rr+UaNnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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