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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5e436594a7ae9c1b85853d81417a243d878cd65be56945858bc7a18adb30d0' 
  AND token = '1Ka6NhPot+FQ4VAWs6RRR/safAcZz81zMuEc/sXvZlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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