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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304dbdf2295f0154012de8334c25062845bfe0166cf62fa2693361ce4e90da40' 
  AND token = 'KMofa+mtqfLJckBLLtVsALC+YdiXl4eAnRj0oVa6UO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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