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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6011fd015e06e1c8e28a96a6c1f483cca437ec62325d8b2f3830893700acf466' 
  AND token = 'A6nbISK62GM6pLAKns/x5tVgGlst3W+kssVnQsvoWtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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