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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258094b393d9f3e3cf628ff0317a06771f96750444ad70609c35d6b60954e213' 
  AND token = '+Mj7/7Ljpn6BIAVV0tBOPj0IaoB5+Od3MY6Ncbnp48c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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