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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194f63417f6b3e89f6400723d29a33786ec40efde1f14c504dd163d7006692a2' 
  AND token = '9g1SmndsJuL5CpevFMosiZHDVVA97aYVIMuXLz1PGtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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