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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f69352fe985cf092d77179496410964b80f7b43230be39901d834ce9165e9c0' 
  AND token = 'va8uwyKjNamkebYKJoW5qdhlVNLp9NMf6uZflZvma3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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