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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dcacad9e9e3b5244be9de4b64f8e6fd09175c31158cfd7381f2e3ec5a4fbb2' 
  AND token = 'dUdYop2SrOc555ua5hn0cQQ7cmoXnI98H+0CFWUbsO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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