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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0526f07a35293f1dd249049e933a76bd4ac9d9c6dcfefb73b52ad1667f8d4be' 
  AND token = 'bF40a39w0HHc5tJJTbgVqM7gTVLvfd3YKT0AM2H2Qr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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