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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552dce4e09c072c95cdd34cf7b459c1689658f7f5ee4a917940b4e1ef96f7348' 
  AND token = 'JnK+ylxGWt+xBYf19agh4AtVV4DEUYHUWiMZ3VrLmdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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