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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccc6f203c3fd8d3615abb640021152beef9dcdcb6e3f57a525c5344919be80f' 
  AND token = 'WJFJuYlQPJN6u+BFv0UqBqdRAM4u+UNcUxZgk+dZYnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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