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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9e20d00f0d4a0177cf0d442b5309c642ba36dda401689fbaf787bdf8a75c57' 
  AND token = '2ndqa6vfQeL82qNTCh+9NI5V5g6qlWxye5iih6yolnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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