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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60146912a7bdc2b831bf8bd443007770138443da3709a2a9b34ffdcf8b945f89' 
  AND token = 'YSY94I+tHHHF6DPgNYw6vdn7ZypDcyrNR/0MGXD4C7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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