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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f3008f08f81a61246fb4fda92f547a6dd06361adf8b8604737a8f18ab4f443' 
  AND token = 'Uar4NCVGF36DrqAX2e2Yla83LyLBJCnxe/hjIWA5M7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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