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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7425b55988e7e11ec7d2f77a8ad2a2fdbac320c7b3702de0ac16818756a8d6c9' 
  AND token = 'oppPQAuDznUqrDBgPmjv1UeMwSvLecy4QtUFVq5C1ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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