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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adedd3bb4a321f737bdd60a94b1c8b336294383d902771144d2ae47c4a5ecb2' 
  AND token = 'd1oigGm60PVi7ESpXAO7ukKaKma9otwyt6RtQXaNUV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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