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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f28c9a9bae5a83e8a0480e5b194102d9bf40c3f1d7b03698924fa8f94d9995' 
  AND token = 'i6T44RBWItCa1VJdKynmKcV2FgvvAIkMGiDP8OKu/PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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