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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9850cb3e13cea00f015fed05009215ce5df728769c65c4ef5469ad630ff6d7af' 
  AND token = 'K4U23AJMN3nRej0bc5dh7/Y3fPx7kvyL5AG5AEs90no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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