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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d883110b72fac8bba00df30eae4103931c1b787ef4642003301da43bf918125' 
  AND token = 'yMl3RFZf5FtSflAHxREfwuGJtUqG8SIeUXM9zOaR/mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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