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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96b706f615d78879654f787a5467edda5279b5ab7287c0b0511293141b92416' 
  AND token = '+0ZeTHpXQ5xwxvl70sytwp6LzgH82vMyfZFEJy3yXtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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