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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee86578f36e954738294d1c83852d82f950c58cfa1d556356ba9f30c2bc3724' 
  AND token = '+BcoRK4Q5NdydTe6EbnoW/6jBlhO/j/zUapSFfT8C9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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