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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced285461871636dd4b616322107d25fccdb8470140b90f85c6679cf4322472f' 
  AND token = 'kk4LcxkhIAs274NhSr1ycUCS2hciBdp8+1mJdr5zBNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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