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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10031f9c07d5d4fa186482485ce064262a2b8e0253952221ee2f7a4c0c3f205e' 
  AND token = 'K9tMme5gJFUR38M6Xndlr9rvikKSh+FOvicVsncrHQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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