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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee678cb4eefc47ee3988c57a8642d5ed89437684d6c5f0a67801eda14b28dd0b' 
  AND token = 'tCLeIal6wfKJC+2Q8vNaBsEm3UMq8A3f30uV+2WkBdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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