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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362fae07ed30bc8ae4dcf66d9fae707231dd42f23d8339a9bac3a317505572bb' 
  AND token = 'wWfffL5k6+0kn5EbpE8Bf7HEmb0RmZL3qV+rqN3Ce70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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