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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ccbe7d517e0fda2dc364c07b8fe3c40ed6275252f3063244baab14c3827460' 
  AND token = 'G7b3uDPnbt8zQjR0WF5brvG/m8Adfd/O2ccOa+iQSyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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